Calamus rhytidomus Becc., Ann. Roy. Bot. Gard. (Calcutta) 11(App.): 7 (1913)

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A local rattan of eastern Kalimantan. (Dransfield, J. & Patel, M. 2005: Rattans of Borneo, an interactive key.)A


  • Data deficient. (Dransfield, J. & Patel, M. 2005: Rattans of Borneo, an interactive key.)A


  • Habit - Climbing; stems clustering; not branching in the forest canopy; not dying after flowering. Plants dioecious.
    Leaf-sheath - Tubular for most of its length; stem and sheath together 1.71-2.09 cm; flagellum long; knee present; with spines similar to the rest of the sheath. Sheath surface with small horizontal ridges; without hairs or minute spines; green; scales on surface lacking. Leaf sheath with sparse spines; spines persistent; upward pointing; of more or less the same size; the larger spines tapered; the longest, excluding those at the mouth of the sheath less than 1cm. Spines straight; in life black; with smooth margins; the bases swollen; yellow when fresh. Spines mostly grouped; where grouped together arranged in partial whorls or combs. Spines around the leaf sheath mouth scarcely different from those on the rest of the sheath. Ocrea - Present; not diverging at an angle from the stem; tattering; unarmed. Leaf-stalk - Absent or usually less than 3cm. Leaves - Ecirrate; rachis armed; not hairy. Undersurface of newly emerged leaflets same as upper surface. Scales absent from leaflet surfaces. Leaflets sessile; 1 to 10 on each side of rachis; regularly spaced and parallel; held in a single plane; lanceolate; the leaflet tip acute. Longest leaflet 30.6-37.4 cm; more than 5cm wide; with none or very few brsitles; the margins with no or very few bristles, or bristles at tip only. Short, dark or dark-tipped up to 5mm long. Leaflets conspicuously plicate; the veins not radiating; midrib raised and prominent adaxially. Lowermost leaflets not reflexed across the stem. Apical leaflets joined to 1/2; not less than 4 cm long.
    Inflorescence - Inflorescence axis erect along the axis, with clawed spines on the primary bracts; not rooting at its tip; much longer than the leaves; the first bract not enclosing the inflorescences at anthesis. Partial inflorescence present; bracts at the base of the partial inflorescences wholly tubular with a neat mouth or a small open limb, much shorter than the partial inflorescence. Rachilla lacking an enclosing bract; not at all pressed against the subtending bract. Flowers arranged in two rows. Male rachillae not less than 1 cm long. Female rachillae not congested; without conspicuously stalked flower cups. Bracts on the rachillae not net-like.
    Fruit - At maturity 1.1-1.5 cm; globose; red resin (Dragon's blood) absent; one seeded. Calyx in fruit split part way and partly tubular. Fruit scales with a conspicuous central groove; the tips not recurved; colour on ripe fruit brown ( including mid, matt, dark brown etc); when dry mid brown (excluding dark margins). Seed hemispherical; the surface pitted; endosperm homogeneous. (Dransfield, J. & Patel, M. 2005: Rattans of Borneo, an interactive key.)A


  • Distinctive in its ecirrate leaf with rather broad leaflets and sheaths with neat horizontal ridges. (Dransfield, J. & Patel, M. 2005: Rattans of Borneo, an interactive key.)A


    A. Dransfield, J. & Patel, M. 2005: Rattans of Borneo, an interactive key.